Crust

1. Preheat oven to 325°F (160°C) and lightly grease a 9-inch (23 cm) springform pan.
2. In a small bowl combine the finely crushed Oreos and melted butter. Mix until the cookie crumbs are completely coated. Firmly press the mixture into the bottom of the pan and slightly up the sides to form the crust.
3. Bake for 10 minutes, then remove and let cool completely before adding the cheesecake filling.

Cheesecake Filling

1. Prepare the ganache. Place the chopped chocolate in a heat-resistant bowl. Place the heavy cream in a small saucepan over medium heat. Cook until the mixture begins to simmer. Pour the heavy cream over the chocolate, cover and set aside for 3 minutes. Whisk the mixture until smooth, cover and set aside.
2. Beat the cream cheese with an electric mixer on medium-low speed until completely smooth. Scrape down the sides and bottom of the bowl as needed.
3. Add the sugar, cocoa powder and salt. Continue beating until well combined.
4. Mix in the sour cream, vanilla extract and peppermint extract until fully incorporated.
5. Add the eggs one at a time, beating after each addition until just combined. Don’t overmix here!
6. Gently fold in the chocolate ganache and the crushed peppermint candies.
7. Pour the cheesecake batter into the cooled crust.
8. With the oven still at 325°F (160°C), place the cheesecake on the center rack. To safeguard against any leakage, you can also place the cheesecake on a rimmed pan. Bake for 30 minutes.
9. Reduce heat to 250°F (120°C). Slightly crack the oven door for the first several minutes to help the oven cool more quickly. Bake for 35-40 minutes or until the internal temperature of the cheesecake reaches 145°F (63°F) with an instant read thermometer. The edges will be mostly set, but the center will still be quite jiggly.
10. Turn off the oven and crack the oven door 2 inches (5 cm). Let the cheesecake sit in the warm oven for 30 minutes.
11. Remove the cheesecake from the oven and allow to cool at room temperature for 2 hours. Transfer to the refrigerator for at least 6 hours before releasing from the springform pan and adding the ganache.

Topping

1. Place the chopped chocolate in a heat-resistant bowl.
2. Heat the heavy cream in a small saucepan over medium heat until it begins to simmer. Immediately pour the heavy cream over the chocolate, cover and let sit for 3 minutes.
3. Whisk the mixture until smooth. Pour the ganache onto the cheesecake and spread the mixture evenly over the top.
4. Once the ganache has set, sprinkle with crushed peppermint candies.